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A brittle shear zone was sampled from Hole C0002P in the Nankai accretionary prism
during Integrated Ocean Drilling Program Expedition 348. Macro- and microscopic structures
observed both in the core and the covered petrographic thin sections of this fault
zone permit characterization of the deformation during faulting. The observed kinematic
indicators are coherent with an apparent normal fault sense with respect to its present-day
position. Calcite veins are restricted to the most damaged interval of the cored fault.
Descriptions of the vein geometry and relationship with the cataclastic foliation
present in the fault suggest that these are extension veins that opened during a crack-seal.
The various generations of veins suggest that a reiterative history of brecciation
and veining took place.